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Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal $ 235.0 $ 220.9 $ 189.7
State 34.1 32.2 28.9
Federal and state deferred 10.3 9.5 13.4
Change in valuation allowance, net 0.1 0.0 (3.7)
Adjustments and settlements (0.5) (0.1) 0.3
Income tax provision 279.0 262.5 228.6
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax provision at statutory rate 253.0 238.8 211.6
Non-deductible expenses (income), net 3.5 1.3 (0.6)
State income taxes, net of federal benefit 23.6 23.2 21.7
Income tax provision, excluding other reconciling items 280.1 263.3 232.7
Change in valuation allowance, net 0.1 0.0 (3.7)
Adjustments and settlements (0.5) (0.1) 0.3
Other, net (0.7) (0.7) (0.7)
Income tax provision $ 279.0 $ 262.5 $ 228.6
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax provision at statutory rate, % 35.00% 35.00% 35.00%
Non-deductible expenses (income), net, % 0.50% 0.20% (0.10%)
State income taxes, net of federal benefit, % 3.30% 3.40% 3.60%
Income tax provision, excluding other reconciling items, % 38.80% 38.60% 38.50%
Change in valuation allowance, net, % 0.00% 0.00% (0.60%)
Adjustments and settlements, % (0.10%) 0.00% 0.00%
Other, net, % (0.10%) (0.10%) (0.10%)
Income tax provision, % 38.60% 38.50% 37.80%
Deferred income tax assets:      
Inventory $ 35.1 $ 28.9  
Receivable reserves 2.9 3.0  
Warranty, chargeback and self - insurance liabilities 63.5 57.8  
Other accrued liabilities 32.6 25.1  
Deferred compensation 28.5 24.0  
Stock-based compensation 24.3 26.8  
Loss carryforwards—federal and state 13.3 7.2  
Other, net 6.8 13.2  
Total deferred income tax assets 207.0 186.0  
Valuation allowance (2.4) (2.5)  
Deferred income tax assets, net of valuation allowance 204.6 183.5  
Deferred income tax liabilities:      
Long-lived assets (intangibles assets and property) (263.8) (233.6)  
Other, net (19.4) (19.2)  
Total deferred income tax liabilities (283.2) (252.8)  
Net deferred income tax liabilities (78.6) (69.3)  
Deferred Tax Assets, Net, Classification [Abstract]      
Deferred tax assets, net, current   68.6  
Deferred Tax Liabilities, Net, Noncurrent 78.6 137.9  
Income Taxes Receivable, Current 11.7    
Income taxes payable included in other current liabilities   17.5  
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]      
Gross domestic state net operating and capital loss carryforwards 110.3    
State tax credits 4.2    
Valuation allowance related to loss carryforwards 2.4 $ 2.5  
Gross domestic state net operating loss carryforwards and capital loss carryforwards $ 7.3